I first started using Free-Track-No-IR and had mixed success with it. Eventually I moved to EDTracker Pro because it was cheaper than Track IR 5 and I didn't have to mount anything to my desk/screen. I honestly love it. I have it attached to my head phones, it weighs nothing, and have the USB cord tied to my headphone line. I downloaded the ide to calibrate it, and I don't need to use and additional drivers. SC recognizes it as an axis. The con of ED Tracker va Track IR is that it's only 3 or 4 degrees of movement vs Track IRs 6, but that doesn't bother me at all. I've used 6 degrees of head movement with Free-Track-No-IR and a web cam and it was not something that I felt was worth the price of Track ir.